Go to your profile and click the pgp button. There you can set your passphrase and generate/update your keys. Once that is done, when you go to pm someone (click their profile -> send message), if they have also set up pgp, you will see an option to “encrypt message”.
Both you and the person you’re sending the message to need to have pgp set up to enable pgp messaging.
A LOT has a changed in past the month, as you can probably tell from the buttons/colors alone.
if you have any questions feel free to message/reply to me on this site and i'll see them near instantly